data/reports/GO-2026-5629.yaml

id: GO-2026-5629
modules:
    - module: github.com/mattermost/mattermost-server
      versions:
        - introduced: 10.11.0-rc1+incompatible
        - fixed: 10.11.11+incompatible
        - introduced: 11.2.0-rc1+incompatible
        - fixed: 11.2.3+incompatible
        - introduced: 11.3.0-rc1+incompatible
        - fixed: 11.3.2+incompatible
        - introduced: 11.4.0-rc1+incompatible
        - fixed: 11.4.1+incompatible
      vulnerable_at: 11.4.1-rc2+incompatible
    - module: github.com/mattermost/mattermost-server/v5
      vulnerable_at: 5.39.3
    - module: github.com/mattermost/mattermost-server/v6
      vulnerable_at: 6.7.2
    - module: github.com/mattermost/mattermost/server/v8
      versions:
        - introduced: 8.0.0-20260105080200-d27a2195068d
      vulnerable_at: 8.0.0-20260625191221-429e03cddc01
summary: Mattermost doesn't properly validate CSRF tokens in github.com/mattermost/mattermost-server
cves:
    - CVE-2026-27659
ghsas:
    - GHSA-rmhw-c3xr-m3xx
references:
    - advisory: https://github.com/advisories/GHSA-rmhw-c3xr-m3xx
    - advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-27659
    - web: https://mattermost.com/security-updates
source:
    id: GHSA-rmhw-c3xr-m3xx
    created: 2026-06-25T15:46:16.78618076-04:00
review_status: UNREVIEWED